I have a chance to buy a rebuilt 8v92ta and a 754cr 5 speed or keep my 6v92ta and put the 754cr on it . I just had my 6v92 set up to 350 hp and it run's great with 9.5 mpg (cdn) is it worth the lower mpg for more hp ? What do you guy's and gal's think thanks dave

The 8v92 and 754Cr is a nice setup if you don't want it I know some one that does he pay you a finders fee hard to pass up a extra 125 hp lol with 1400+ lbs of torque, yours a newly rebuilt 6v92 which will serve you well for years I doubt I would do it but we all do strange things

Anyone with the 8V-92 @ a high hp running #40 oil, spin the rear main bearing YET? Prime reason I only ran the #50 oil in my crazy 8V-92 setups, no issues, but the outfits running the #40 are legend for rear main issues. Just wondering as I also prefer the 8V, but most know why the bus outfits went with the 6V, lack of rear main issues, more miles per rebuild, yes we all have a buddy who is married to the sister of the mechanic who always gets 2 mil miles from the 8V-92, right ?

Now It's clear as mud . With what I have now at 65mph my tack is 1700 rpm and this is usually the speed I set the cruise at. With the 5 speed I know the final drive is 1 / 1 but to have the extra gear between 3rd and 4th would be all I need to make the set up almost perfect. Now after driving the 6v92 with little power for the last 6 years. But now with the ddec change with the 350 hp or more the drive is very relaxing. With the 8v92 I know there will be more power still. But how about the eng heat and reliability and mpg ? again thanks dave

MCI had great success with the 8v92TA set at 400 hp lots of those still on the road IMO the 8v92 is more durable than a 6v92 a 400 hp 8v92 will do as good if not better on the mileage as a 350 hp 6v92 DDEC or mechanical

I still would keep your 6v92 with a fresh rebuild over a unknown 6v or 8v the main bearing on a 8v92 has never been a problem for me using 40W oil I guess things could happen